As i was looking for DAP cannisters on the web (we've mentioned blue's little sing songs, right?), I came accross a website which was good and cheap. When I went to order, I noticed that their phone number had the same area code as ours. Turns out they're in the next village so I emailed tem and collected the DAP in person. Really nice bunch, and very cheap, so I thought I'd pass on the site.
If your dog needs regular perscription for anything, check their prices. If the drugs need a perscription, there's a form you can print out to get your vet to sign (They may put a pouty face on, and charge you for their autograph - but you can save A LOT of money).