Buy.com has Popcorn for $29 (after rebate - which seems like just about anyone qualifies for... it says if you use any Roxio product, iLife product, or any version of Mac OS 10.2, 10.3, or 10.4!)

http://www.buy.com/retail/product.asp?sku=20364765&loc=105&sp=1

They're also selling Roxio's new Boom Box software for $31 (also after a rebate that anyone can redeem - any Roxio Mac user or any iPod owner qualifies)

http://www.buy.com/retail/product.asp?sku=201615969&loc=105&sp=1

AudioHijack is great software... and that mixing thing sounds pretty cool too.

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Amazon is also selling Popcorn for $29 if you like to buy from them instead.

http://www.amazon.com/exec/obidos/tg/detail/-/B0006IJ0TS/ref=pd_ts_sw_16/002-9778919-5...tware&n=229643