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Need to change over some minis from squares to rounds and was looking for a good source with a wide variety. Any suggestions?

I just use the official GW bases myself.

I go here: http://www.6squaredstudios.ca/
Pretty sure he ships to the US. They're pressboard bases. Stronger than the GW plastic. They don't have an incline, though - the edges are 90 degrees.
I love them, personally. Moreso than GW's, I think... they're at least an amazing alternative and quite inexpensive (esp. compared to GW!).

Ebay.

I dont like pressed board they WILL eventually warp.

and personally ascetically i hate the 90degree square look as i also hate the round over look of warmachine.

you also lose out on the underside cavity which is great for uneven tables and terrain but thats the same problem you get with resin bases. imho

Secret Weapon makes beautiful bases for both AoS & 40K ...reasonable priced for giving you options for all size bases.

I got mine off ebay. warganner 32mm bases 60mm oval base that sort of search term