Have been looking at using Tomics for the spring season as well. Did pick some up on ebay, and have been working on placing an order directly with Tomic.
Just received an email from Catherine - very friendly and easy to work with. The most popular colors on the east coast (from a sales perspective) are:
248
203
745
404fe
(Don't know if this is a ranked order or not)(None of those are the red/white).
I'm going all the way with the rattle, and the echip. Based on what I can find online, their price for the echip is low ($3.00 canadian). What can it hurt, and you won't find it cheaper online (apparently they have an agreement with the manufacturer - but can't sell the echips without a lure).
So, I'll be out there trying them this spring - maybe if a few of us are doing it, we can give some feedback on whether the technology actually works.
Good Luck!