If you're wanting to keep costs down, I see new transmitter packs on ebay fairly often that go for under $10. They are from guys buying new radios who want a high capacity pack so they replace them without even using them. Otherwise, the www.hangtimes.com packs are a good buy.

As for a charger, there are many on the market that will take care of all your NiCh/Nimh needs. Any of the Triton series (Electrifly brand), any Hyperion that has the cycling capability (very easy interface on the Hyperions too), Thunder Power, and the list goes on. Keep in mind that many chargers run on DC 12v power only, so if you buy one of those you will also need a power supply. A standard lead acid battery will work fine if you have one for your field box, or there are a number of AC power supplies for them. I bought a Triton EQ which was more expensive but it has an AC adapter in addition to being able to use DC, and it also has a balance board built it to take care of all the lithium batteries.