I use them for Luna's metacam sometimes. usually has been here within 3-4 days. but I'm never in a rush for Luna's metacam as I order in advance, plus its a repeat prescription, not something I need right now so to speak.
if you need it now, might be better to get it via your vet tbh, so you won't be waiting. but I do appreciate if money is tight online might be better. for instance if I was to go through my vet I'd probably pay £70 for a bottle of metacam from them (100ml). via one of the vet sites I pay £25 (bottle and prescription) with a small delivery fee. works out a lot cheaper than direct from my vet.