For larger, firmer produce like pineapple, apple, cucumbers, etc., a centrifugal unit is perfectly fine and tends to be a bit easier to clean. Masticating juicers will handle just about anything including, berries, spinach, kale, etc.

For orgeat, we need a blender or food processor. A 4-cup Cuisinart FP can be had for $50. A Ninja blender can be had for $90.

A brand new centrifugal juicer, suitable for home use, can be had for as little as $65. A two-speed unit is most versatile. Ultrean and Hamilton Beach both make affordable models. Breville makes excellent units but start at $180. We use Brevilles in our programs.

Masticating juicers can be had for <$100, like this Omega H3000D. Ninja and Cuisinart both make decent, affordable models. Our juice bar uses a higher end Omega and it only struggles a bit with wheatgrass.

You can probably find a used centrifugal on EBAY for $50-ish and a masticator for $80-ish. I suppose it all depends on how important a new, warrantied model is to you and whether new is worth an extra $20 or so.