The Tomkat was a fantastic starter bow and one I would reccommend do anyone looking to get started in archery on a budget.
However they do not make the Tomkat any more and buying one off of Ebay will void the Bowtech warranty (or any factory warranty). If you are well versed in bow mechanics and can work on your own bows well then Ebay is a great place to find a deal but if you are new to the sport tneh I would strongly recommend against Ebay and tell you to go to some pro shops. You will get set up right from the get go and you will have a lifetime warranty to go with your new bow.
Three bow packages I can recommend with out hesitation are...
Bowtech sniper package (replaced the tomkat)
Diamond Rock package.
Fred Bear Lights Out package. This bow shoots amazingly well and quite a bit better than many higher priced bows on the market today.
These packages are going to run you about $550 new but worth the extra money IMO for peace of mind. The only thing you will need to add would be arrows and a release.
Now, if you can find a Tomkat left over from 2008 at a dealer then you can likely get a fantastic deal on a fantastic bow.
Good luck.