You can buy a used round column milling machine for that kind of money. Lathe milling attachments, especially ones on a small and light lathe like that, will be quite limited in the work they can do. Most of the lathe milling attachments I have seen for that size lathe appear to have been used once and then put away on a shelf to rust.Just did a quick scan of eBay sold listings for the milling attachment. There were quite a few sold and they ranged in price between 200 and 375 dollars.