Depending on how many more of those batteries you are going to buy, you might save money ordering lipo batteries from hong kong, considering they're only $6 to $8 each. Thing is they always get you on shipping. Hobbycity carries them and inexpensive battery chargers as well. If you want to look for local stuff I don't believe it would matter too much what you chose. Ask the person behind the counter for an inexpensive peak charger for 1/18th size batteries.
Ordering from hong kong:
2x Lipo: $16
1x Lipo charger: $10-$35
Shipping: ~$25 registered air mail (7 to 14 day delivery)
Buying local:
2x DTX battery: ~$40?
1x peak charger: ~$20?
Either way you go it would be about the same but Lipo's are more fun
