splinter182:
That is true, and with limited space its hard to make things easily removable!I've found the site of the ebay vendor of the MP3-Flash-16p module, cheaper than ebay and free shipping.
Thanks for the link. This guy seems to have all kinds of goodies for sale. 
I wonder how much flash memory the module actually has. The product description says it can support between 2M and 16M but it doesn't actually say how much is on the one being sold. 2M might be just enough for one font at a low quality sample rate, but 16M would give you breathing room for perhaps 2 or more at a high sample rate. The later being preferable, of course.