Check your local camera shops; if they dont do professional developing, they may know of someone who does. Our local one has what I call a magic machine. It's made by Fuji and is like a copy machine, only what you get is an exact duplicate photograph, on photographic paper, sometimes better looking than the original, plus you can have them done in any size you want, and yes, they can do it from a slide or negative. Black and white is no problem.When I couldn't afford good shot of my jewellry for sale, they put it right on this machine and it spit out gorgeous looking photographs. Amazing.
TIt may be a little pricey, is the only drawback. You can put as much in the 8 x 10 space or whatever space you want to pay for, so it is less expensive is you say four of a small photo which they can print on a bigger sheet and then just trim each one to foud individuals, but that wouldn't work if you have to have 8 x 10's.
You might check Fuji online for a store which would have that machine.
Hope this helps,
kat