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I think they're called birdcages or something similar but cages like these I've brought in the past on amazon and they're alright. They're comfortable to wear but they do create a bit of a bulge however and are somewhat heavy, and you can easily get out of them the cheaty way but that's true for most chastity cages.
There are cheap knockoff versions of the HolyTrainer V3 and the CB600 on amazon that are sold under a generic name, did get myself such knockoffs in the past but they're not amazing. The CB600 knockoff was my first ever chastity cage, clear plastic white, not very comfortable for extended wear but for the short term it was fine. The HolyTrainer V3 knockoff I actually brought a couple months ago and honestly it's rather shit, sharp edges and the lock can't even be inserted into the cage most of the time due to the cage's cheap design :/
The one I bought on Amazon for 20 bucks is good for a big dick mine is around 5.5 in fully hard and the cage is around 4.7 in so it’s big when I’m soft but the cage doesn’t let me get fully hard which is nice until I can fit into a smaller cage. Amazon link
It’s my second and favorite one so far. I got it on amazon to replace a heavier cheaper one. The product page is no longer available which is normal for this kind of thing but here’s a link to what looks like an identical one.
UleadeTM Steel Metal Male Chastity Device Locked Cage Sex Toy for Men (3 Rings) https://www.amazon.com/dp/B01I155M94/ref=cm_sw_r_cp_api_i_rCPEDbS2FY44N
The Curve is definitely a better option, but I'd suggest trying this metal one. It's cheap at $19.99, has dimensions similar to the curve and is a little easier to get into since the metal isn't as "grippy" as plastic. (But you'll want to change the lock as the corners are to sharp.): https://www.amazon.com/UleadeTM-Steel-Chastity-Device-Locked/dp/B01I155M94/ref=sr_1_1?m=AS3ONNPQIORFU&s=merchant-items&ie=UTF8&qid=1520756125&sr=1-1&keywords=chastity&th=1
Something like this will do you fine.
They're generically sized cages and they're about 100x36mm. The selection of base rings is handy as well. Very comfy cage.
Oh yeah, it's crazy how much you can spend. To be clear, I don't recommend either of the authentic ones for someones first device unless they really want to spend that much on something that might not fit.
The knockoff ones you linked are actually alright- I'd go with the "The Keep" one because it'll be more comfortable, durable, and discreet underneath clothing (and because it won't split down the seam like the other kind is prone to doing).
Or, if you want something metal, this device is a good litmus test because the tube is big enough to fit almost anybody, and it comes with multiple rings (so one will probably fit you well). It's not made of actual stainless steel, however, so it won't last as long as most (even cheap) metal devices will.
wear one of these things: https://www.amazon.com/UleadeTM-Steel-Chastity-Device-Locked/dp/B01I155M94/ref=sr\_1\_6?crid=1GA4BUTAU5BEQ&keywords=penis+cage&qid=1668286997&sprefix=penis+cage%2Caps%2C106&sr=8-6
Uleade Male Chastity Device Cock Cage Steel Metal Silver Locked Cage Sex Toy for Men (3 Rings), Lock and 2 Keys Included https://www.amazon.com/dp/B01I155M94/ref=cm_sw_r_cp_api_glt_fabc_DB1ATMDJWKEP116HXZB9?_encoding=UTF8&psc=1
I have 2 cages. bought them both on amazon. My 1st one, the cage was longer. amazon I not quite the right fit. then I got this one amazon fit much more snug. now I am not a pro at all am just having some fun. really look around, try and get some measurements of yourself. The base ring is important too. have fun!
I'm about 7 inches hard, and I fill this cage here comfortably. It's not actually stainless steel and the bars are thin, so it won't work well if you plan on wearing it for long, but it'd probably be an improvement over your current device.
I've never tried it, so I can't speak for the quality, but here's another even larger one that should be comfortable if you still have to squeeze into it.