Bidets - no longer just for European royalty. http://www.amazon.com/Bidet-ELITE-Natural-Water-Nozzle/dp/B005V1SZR8/ref=sr_1_1?ie=UTF8&qid=1382803165&sr=8-1&keywords=bio+bidet
Once you use it, you'll never want to poop outside of your own house again.
There are better models by the same company. I would get this model for a non-electric version:
Source: Employee for the company that OP linked
Editted to add:
I forgot to answer your questions:
It runs on your water pressure at home, so if you have strong water pressure at home, you will get a strong wash. I do not have strong water pressure at home, so I have to turn it to full blast (which is more than enough).
It is $30 with a 1 year warranty. You kind of get what you paid for, you can get other models for $700 that have all the bells and whistles that will have a 3 year full warranty, but for something this cheap, anything more than a year is gravy.
It is extremely easy to install. Turn off water at the shut off valve underneath the toilet. Unscrew your existing toilet seat. Unscrew pipe from shut off valve to toilet. Install supplied t-valve at underneath tank (if you don't have access to the tank, a t-valve for the shut off valve can be supplied). Install bidet underneath toilet seat. Re-install hoses. Turn on water. Check for leaks.
We have one of these on every toilet. bio bidet elite 3
Lowes has a bidet seat for $99
https://www.lowes.com/pd/Brondell-Ecoseat-Plastic-Elongated-Slow-Close-Bidet-Toilet-Seat/1002260720
I have a Biobidet attachment, about $50 (without seat)
https://www.amazon.com/BioBidet-Non-Electric-Mechanical-Attachment-Posterior/dp/B005V1SZR8
Or you can go deluxe with Toto etc, with warm water, heated seat, dryer even lights!
In the US. See https://smile.amazon.com/BioBidet-Non-Electric-Mechanical-Attachment-Posterior/dp/B005V1SZR8/ - in Q&A section. I suspect Home Depot is lying, but hope not