Yep, avoid the vermex (not that it's harmful - just that it may help digestive help but no proof that it does any harm to worms!). Order online - honestly Farm and Pet Place tend to undercut the feed suppliers (round here anyway) and so you make up the for the delivery costs (and petrol having to drive around all the feed suppliers) by paying less for them. If you ordered now, chances are you'd get it on Weds or Thursday. For the Flubenvet pellets, they have a vet who gives you a call just to check you know what you're doing - it basically goes along the line of how many birds? have you used it before? seven days treatment no more than every 3 months? OK, go for it.
H