failing that, (which is highly probable, A600 accelerators are fairly scarce) you should immediately buy the 1mb chip mem expansion for the a600 if you don't have already, and seek a cheap PCMCIA Sram card for fast mem.
jens shönfeld of individual computers was working on an accelerator board for the A600, but the last news was that the project halted after (?) production. Most probably due to a bug found in the boards.