+1 on Podster's comment. Thanks to @rayliam80 for posting up the Rat Shack eartip deal.
While I would have loved to get the (2) pairs of M for $1, I was perfectly happy getting the full SML set for $1.50. I even used a coupon code I found online for an extra 15% off! They do have plenty of S and L in the "2 for $10" version. On Radio Shack's website (radioshack.com), the part numbers are as follows:
S "2 pairs for $1" kit: 3300783
M "2 pairs for $1" kit (sold out): 3300784
L "2 pairs for $1" kit: 3300785
SML for $1.50 kit: 3301585
15% off coupon code: RADIO15
** Free shipping on website orders over $19.
Note: Since they made the coupon code to predictable, be sure to try RADIO20, RADIO25, or RADIO30 to see if you can get an even bigger discount! I've used that trick before at other websites!
I've never even seen or heard of the Auvio tips (not sure how I missed all of the recommendations on them). Anyways, I'm glad I did because they are really nice and fit great. They are a different shape than your typical wide bore tips (such as the KZ/Tennmak Turbo/Whirlwinds). They are shaped more like a KZ Starline or Sony Hybrid, except with a wide bore. Very nice feeling and grippy!
I'm glad you enjoy them. I bought Auvio tips a couple of years ago when I got the ATH-IM70. A lot of people on a particular head-fi thread said they were a good fit and sound for that IEM. Looking through one of my junk drawers, I came across the packaging and remembered them then just decided to search for them randomly if they were still around. I paid like $7 or $8 then for 2 pairs originally.