Consider making your own... It’s easy and cheap if you take time to source the materials, and you get a better result IMHO.
1. FABRIC: I source this from my local chain fabric store, Joann’s. They frequently have sales and coupons, and you should be able to get something really nice for under $50 at your size. I like to use outdoor-grade fabric so we don’t have to worry about spills and I can wipe it down after each session.
2. FOAM: I found a place near me that sells closed-cell table-grade foam by the yard. It’s really cheap—again, you shouldn’t have to pay more than $20-$30.
3. ADHESIVE: Look for high quality spray adhesive from a fabric store, or big hardware store. 3M is a good bet.
4. UNDERPAD: I browsed the remnants at Joann’s, and bought a piece of faux leather for about $10 to put on the underside so the foam does not get tacky with the table surface, but also doesn’t slide.
5. ASSEMBLY:
(A) Lay the piece of foam down on your table and use a ruler and a felt pen to mark the edges. Cut it to exactly the size of your top with a utility knife or fabric scissors.
(B) Spray the foam liberally with the adhesive. Let it dry for a few minutes. Then, with a friend, carefully center the fabric over the foam. You probably should do this outside, or open all your windows.
Assuming your table is a normal width, and your fabric is a standard 54" wide, you can either let the excess hang down over the edge like a tablecloth, or trim it later if you want a shorter “drop.” Alternatively, you could fold the cloth under and adhere it to the underside, but I find that looks worse and makes things complicated.
(C) Make sure to really smooth out the adhered fabric while it is still tacky to avoid wrinkles/bubbles. A rolling pin or similar object is useful here. Then I like to lay down books covering the entire surface for a few hours.
(D) Repeat with the underside, except you trim the excess rather than letting it drape.
This project should only take an hour or so at most, not including drying time. I find this has allowed me to really choose the surface I want and to get just the right size.
The topper can be removed when out of use (though I wind up leaving it on a lot of the time, as it looks sharp and is waterproof. It is important not to leave sharp objects on it overnight, as it can leave dings.
When removing, it should be rolled loosely, not tightly, so that the foam does not crease. I actually prefer to hang it up in my basement, or over the edge of my other (built) poker table.