I have minimal experience with this organization, and all experience I have had is through clients who went to there and had to go to the GP because something wasn't caught. I personally see no point in declawing at a spay/neuter clinic because of that. Legitimate medical reasons aside, declaw is a personal choice, so I don't think that there should be a 'low cost declaw' for those instances (might be an unpopular opinion, so I apologize if I offended anyone).
As for the medication, on their website it says, "If you purchased take-home pain medication, you can begin giving it to your pet the day after surgery." For March, they're advertising $20 spays and neuters and they say, "Additional fees will be incurred if owners purchase take home pain medications or antibiotics" which indicated that they don't provide take home pain meds. Which I think is sacrificing standard of care and good welfare.
I know that post op care and medication isn't always feasible- like a TNR clinic where the cats are mostly feral are won't be receiving care. But still. For a privately owned animal, I think it's different.