I think the Flying Pig is a good option on Amazon. I bought this and put on a cheap table from Walmart for $30. I wouldn’t recommend it unless, your dog is very calm and still.
Have you bought clippers yet?
I tried cheap ones but it would not cut my standards hair very well. I bought good Andis ones and it cut my time in half, if not more. It’s a big but important purchase from my perspective!
Also get a tether to secure the dog to something sturdy. I have not tried this item personally, but it may work for you.
This one is cheeper, also has good reviews (for whatever they are worth) and may be sturdy enough for a smaller dog.
This third one looks more sturdy than the other two, but it’s hard to tell.