All Stars and Montana are good. Pussycats and Jungo Junta Fang Pi or Bezerk is pretty good. Mono Skeelz I reckon is very cheap.... Chiara 6k Redra 0.5k Sasha 2k thats 8.5k Sandro 0.3k 8.8k Snowflake 2.5k 11.3k Belgosi 3k 14.3k Greem 2.5k 16.8K And Jay or Corvus which uses about 33k. (Note Danae and Corvus are good subs when cards are banned.)
There are a great deal of decent decks you can make for 30k. It depends mainly on what you like to play and what is banned/unbanned for the week.
Jungo is excellent when Askai is unbanned but they are somewhat weak against SoA. A Jungo half deck can be well under 10k if you don't use Niva or Ongh.
Ulu Watu, All Stars, Uppers and Roots are all reasonably cheap and good in elo. I would recommend a half deck between two of these clans.