Depending upon size, Keyence has several small area imaging systems which are a lot cheaper than an AOI.
Also, even if you get an AOI, be careful that they have the right zoom camera installed. We recently bought Koh Young AOIs and had to wait for the upgraded cameras.
If you are looking at Desktop, 2 options are the EVO CAM by Vision Engineering or Ultra Cam by O.C. White. Both run up to 60X.