Example output
Okay, based on the information provided, here is my assessment of this used toaster:
Price of $20 - This seems like a reasonably good price for a 2-year-old toaster that can toast 4 slices at a time and appears to be in good working condition with no damage or repairs. There is some room for negotiation which is good. However, without a warranty, there is more risk that it could require repairs or have a shorter lifespan.
Reliability - Since it's only 2 years old and the seller claims it's in good working condition with no issues, the reliability should be decent for the price. However, older small appliances do tend to become less reliable over time. There is a chance it could develop problems within the next year or two of regular use.
Resale value - Given its age and lack of warranty or brand name, the resale value will likely be limited to maybe $10-15 if/when you want to resell it. So while $20 seems fair for your own use for a while, it's probably not an appliance that will hold its value well over the longer run.
Overall, this could be a decent, budget-friendly toaster for your needs, as long as you go in with reasonable expectations about its longevity and resale potential. But for the money, it seems like a fair purchase if it's in as good a condition as described. Be prepared to potentially need to replace it within a couple of years though.