Twiggy; to keep costs to a minimum you might condider getting an old WS directory (or go on-line to find a florist) and simply call florists direct with your own credit card. Many will still give you some kind of trade discount. Even if they don't you have looked after your customer. It's a quick fix while you decide if you should join a WS.
Thanks Bruce.. that's what I do, I go online and find another florist, usually I use the locate-a-flower shop network, I've found florists from there are open to the direct ordering with my CCard. in 9 months (since I've opened) I've only had one tell me no. It's worked very well for me this way so far.