Info about my Kenwood(garmin) kna-g510 gps, sd slot

Perhaps if you search for KNA-G510 on this site -
You may find some additional info. Although I think it mostly pertains to poi's and loading them. You might even be able to contact other users of that model.
There are also several discussions here about SD cards - what size to use and weather to format or not to format - ultra speed or normal speed -
Search using sd card and there will be about 12 pages of info that contains sd card.

Well, Garmin replied back to me... They said to make sure its a normal SD card (non-high speed or high capacity) That is no larger than 2 gigs.

So I've been in the market for a cheap SD card & reader.

I ran across this one on ebay:

http://cgi.ebay.com/128MB-SD-FLASH-MEMORY-CARD-and-USB-CARD-... Z50526QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

EDIT:
maybe an easier way to get to it:

Ebay Item #: 180102283377
You can just copy/paste the number into the search box and the item will come up.

Will this one work, for my uses?

Just go to Best Buy, Office whatever or even Target, or Walmart. They are always on sale. BB just had a three pack of 1gb cards for under 40. I picked up some 2gb cards at Frys for 18.
Just get the plain ol' cards, avoid the HC or Ultra or Supreme or Extreme or HighSpeed or the 60X or 80X etc. Get the Plain Jane SanDisk, PNY, Kingston, they've all worked for me.

If you need a reader/writer any inexpensive one will do.

X2, from my understanding, there isn't anything bigger then 2GB SD card. They just format it special to get 4GBs on it.