usually ~$40. Compatible with other smash up products.
Also of note is [exiled legends] for $19(https://www.ebgames.com.au/product/toys-and-collectibles/252…) by the same publisher as unstable unicorns. From the very little I can find on it, the rule book is garbage and there are balance issues but its otherwise well reiceved.
Not as fun as other expansions but $20 for 8 decls is pretty good.