I found some very fine TLC spotters many years ago, and they are excellent. The problem was that they had to be made in large orders, so we had to buy a bunch. They are about 1 mm dia and 100 mm long, and come 1000 to a tube, they cost us about $40 per tube. If anyone is interested in getting some, send me an email at craigslistinnc at gmail-dot-com and et me know where you are. These are very fine, so they are great if you want to run many spots per plate (I usually do 6 spots per 2.5 cm plate and 12-16 on a 5cm plate). Chemglass and a few other companies sell spotters, but find that they make far too large a spot for good TLC of close spots.
Bob