Scruff's flea and worming stuff usually costs me around £40 every 3 months or so. He is allergic to fleas so we have to be extra vigilant with de fleaing him or he will bite himself unitl he bleeds 
Now I have 2 dogs instead of one I thought £80 every three months would be a bit hard to find. Not to mention paying double for annual boosters. So I joined them both to the healthy pets club, which is like a pay monthly scheme.
It's around £11 per dog, per month. This pays for all their flea and worm stuff, 2 health checks per year and annual boosters. As well as 10% off any medication I need for them (i.e Scruff's dermatitus shampoo, which is only £6 per bottle, but still...) and 20% of Hills Science Plan (i.e the cats food)
We also get the pup micro chipped for half price and 10% off spaying her and 10% off the consultation fee if they become ill. And we can buy their id tags for £9.99, as opposed to £15.
DH is not happy and thinks I have been ripped off and we would have been better off ordering the flea and worm stuff online, like I used to.