We've got two HP Photosmart C4380 all-in-one machines that use the 351 and 350 cartridges. If you can get hold of them, the 350XL and 351XL cartridges are much more economical than the bog-standard 350 and 351 cartridges as far as printing costs are concerned although they're more expensive.
There are a few C4380's on sale on ebay that look in good condition.