I was browsing through Fry's the other day and noticed they had a 40 Second Message Recorder kit for sale at $9.90 each. The kit comes complete with all parts - you just solder them on to the board. Made by Twin Industries, and on their site
selling for $29.99, thought I'd give it a try. (I bought all three at the Manhattan Beach store.) Took me about an hour to assemble it - hardest part was figuring out which resistors were which.
After poking around, I found that the board is similar (but not identical) to the Cowlacious board. It uses and comes with the ISD1740 ChipCorder but can use all of the ISD1700 chips for longer messages (up to 480 seconds). You can record using a built-in or external mic, and play back up to 40 seconds at the default rate. I recorded several five-second sounds and was able to cycle through them.
I'm gonna try connecting it to the prop-1 (should be easy) using the push-button connections, but there's also an SPI Interface which is supposed to allow much greater operation. I'll have to check that out soon.
Anyway, for $10 and just a little work, I think it's a good device for simple sounds.