Right well...I have a new idea for a thread...
If you care...every new coin I get, i'm going to post a picture of it in this thread...maybe with a comment.
This week so far, I have filled 3 gaps...in a sense.
I don't really collect one type of coin and go for all the different years and mintmarks...but I try to get one of each type...
Today I got this 1942 half dollar...

with a mercury dime...for less than $6. (feel free to grade them both)
I've been in a US coin phase now for a few months...and I've always wanted both of these...but could never find any in as good enough grades...or for a low enough cost.
I also got this Peace Dollar last saturday, another i've been after for ages...and in Fantastic condition...only $12.
I've now got at least one example of a Morgan, Peace, Ike (1776-1976), Susan B Anthony and Sacagawea dollars.
I'll be looking for a normal Ike now...pre-Morgan dollars are worth loads.
Also collect half dollar/quarters pretty much any US coin really.