It really depends on the type of glue on shoe you want. I've only ever had experience with sigafoos and they're fabulous, but pricey. We used the Elite Flat (Elite Flat Glue On Horseshoes by Sound Horse Technologies
). You had to be careful about turning the horse out in muddy/wet conditions, but otherwise they held up really well and really made a difference to the horse that needed them. His feet were atrocious and he could not hold a regular horse shoe. He competed through Advanced level eventing with them.
ETA: He also got equipac though which definitely affected the price, now that I think about it. I don't know what the shoes cost was individually, but to get him shod total it was around $250-$300. Our farrier is also the USET farrier which bumped the price up, I'm sure.