Me & my good pal regularly do the most unregular things when it comes to buying & trading things! Most people buy & trade collectable items, however not us! The two of us absolutely buy & trade air filters for our central heating & air conditioning units! There is a logical reason for this…it is because in the section I live, the style of air filters she has & enjoys are a lot cheaper, & in her local area, the special top grade HEPA air filters I like & use regularly have some kind of discount sale going on, but you can say we both live in the reverse sites of where we should be! The prices of our air filters regularly come out close to the same, however so, what we do, is when we go to buy air filters, I buy for him, & she buys for me.
Then, we will meet up on a weekend & trade the air filters we purchased for our central heating & air conditioning units.
The two of us both have similar central heating & air conditioning units too, however it is just that we both like unusual kinds of air filters, and she prefers these generic brand air filter as to my top grade HEPA air filters! If I liked the generic air filters, I would not have to trade with him, but, I found that generic air filters need to be changed quicker than my HEPA air filters that I absolutely love. So, this arrangement we have works out super well for the both of us with the trading & buying that we do for each other!