Within reach? Knocked one off the list yesterday by winning an online auction for a solid koa concert uke. The photos and description make is appear to be almost new, which would put my winning bid plus shipping at less than half the price of a new one. Solid wood ukes are pretty expensive considering they're factory-made in China and Southeast Asia. Even at the price I paid it is expensive considering I have yet to get close to mastering a few chords. But like Japanese knives, even just playing a cheap laminated uke for a bit leads to addiction, known as UAS (ukulele acquisition syndrome). I have open alerts on CL, Kiiji (aka eBay Classifieds) and eBay for many more.
Similarly, the Irish whistle or penny whistle is a very cheap instrument to buy and learn. Many of the best whistle players use cheap, factory-made whistles that cost less than $10. But picking one up and learning a few melodies instantly leads to WhOAD (whistle obsessive acquisition disorder). Within a month of finding an old Guinness-branded Walton whistle in one of my storage boxes, I acquired six more inexpensive soprano (D) whistles ($10-$35!) along with two custom, telescopic Ds ($100+) for when I travel. Whistles start at about $10 and collectible customs can go up over $1000. I will never be good enough to justify a one of those, but knowing that many of the best Irish Traditional Music artists recording today make their livings playing sub-$100 whistles makes this a somewhat unique obsession. I have my eye on a few soprano whistles in other keys and one or two "low" (tenor) whistles in C and D.
I blame my ADHD.