I was faced with the sane dilemma you are just a couple weeks ago. My Dan Wesson V-Bob came with flush fit 8-round mags from checkmate. So there are flush fit 8 rounders even though they are not very common. The reason I believe is because its hard for the springs to hold up very long in that short of mag body. Most 8 rounders are longer than standard to accommodate the extra round and spring length needed and require a basepad,which makes for a solid 8 round mag in the long term.
The big names for 8 round mags with baseplate a are wilson combat and tripp,I just ordered two 8 round tripps and a 10 round mag. I chose tripp because the part of the follower that interacts with the slide catch is reinforced with metal,so it won't wear out. I liked that notion alot.
My solution is to just carry the flush fit mag my gun came with in the gun and carry the tripp 8 round mags with the baseplate as reloads.