SuperBiz has the incredibly fast SSD by Super Talent for the Dell Mini 9 & 12 for $49.99 with free shipping and $5 off with coupon code 5OFF20. There is an additional 5% off through Bing.com's cashback.

Product Info:

Specifications
o Mfr Part Number: FEM16GFDL
o The Half Mini 2 PCIe SSD is an upgrade module specifically designed to be a drop in replacement for the Dell Inspiron Mini 9 netbook PC
o Capacity: 16 GB
o Interface: Custom IDE/PATA
o NAND Flash: MLC
o Operating temperature: 0°C to +70°C
o Performance: + Sequential Read Rate: 80 MB/s (max) + Sequential Write Rate: 40 MB/s (max)
o Power Supply: 3.3V ± 5%
o Dimensions: 30 x 51 x 3.5 mm
o with Super Talent’s 2 year warranty

Customer reviews from Newegg.com

They have another SSD by Super Talent which is also compatible with the Mini 9 & 12 but much slower (Read: 40MB/s Write: 15MB/s). I was considering getting this model last week when it was about $20 cheaper but not now with the faster drive's price drop.

Added note:
If you are looking to upgrade the memory in your Mini 9 the max is: PC2-6400 (800MHz) for speed and 2GB for size. SuperBiz has a 2GB PC2-6400 notebook ram for $21.99 with 5OFF20 coupon, plus free shipping. The coupon is a one per customer code, but I did use it twice by logging out of SuperBiz's site and logging back in as a new customer (only had to change my email address).

WTH? It's $58.89 through Bing!

And this just in, email confirmation of $2.50 CashBack from Bing.

read an article that this should finally start dropping in price towards the end of the year. I'll try to find the article.

Dell mini 9's on the outlet site starting at $209 (comes and goes so keep checking if not there right now)