Aiprobotics - I do not see any combination of words that make sense here ("ai" and "robotics" would be good but you have a "p" there which makes no sense). "Aip robotics" doesn't sound right either. So, I can't price it (0).
Stonecosta - While "stone" is a valid word, "costa" isn't so much and those two words together just make no sense. So, in all honestly, this domain doesn't really have a price either, because no one would buy it.
Handysweets - This is the best one out of the above three; handy & sweets are dictionary words which make sense & sound good together and can be used by a candy/other sweets-related store or company (may rebrand to it). So, I'd price it around $100-$500, but it's not taken in any other extension and would probably require some outbound marketing to sell, i.e. contact physical/online businesses and convince them to buy the domain. Also, Googling "handy sweets" (in quotation marks) shows a handful of businesses with this term including a fairly active one so that's probbaly worth a shot. Goodluck;]