The third generation Kindle is cheaper than 250: you can get the K3 with Wi-Fi for $139 and the Kindle with 3G and Wi-Fi for $189.
You can add the "special offers" Kindle, which is the Wi-Fi version (normally 139USD) for $114. It basically means you'll get ads on it.
The Nook is also cheaper than 250 USD now.
There are many options under fifty dollars for a portable reading device. Amazon has an olympus digital voice for forty dollars, a sony digital voice for thrity dollars and many more options for under fifty dollars.
Sony CD Walkman D-EJ011 CD player is a great portable cd player for under 200 dollars.
Anything is possible but I doubt it for under $400. It is far easier to go the other way and convert from portable with a manufacturers kit.
There are portable water ionizers that cost under $100 dollars.
You have to go to amazon.com and go to "manage account" it should be under there.
Foxconn, the world's largest contract manufacturer for electronics. The same company that produces iPod, iPhone, Mac Mini, Intel brand motherboards, PlayStation 2 and 3, Wii, Xbox 360 and some cell phones for Motorola.
Go to amazon.com and under "shop all departments" (at the top right hand side of the screen) go to "kindle" and then "kindle books"
The Apple Magic Mouse is the best Bluetooth portable mouse under 50.
first make sure you are logged into your amazon account. click on mannage your kindle. a list of all you'r books will apear. on the left in the option bar under your kindle account you need to click manage your devvices. your registered kindle/kindles will appere. above a image of a kindle and under a subtitle saying kindle name it will have the current name of you'r kindle. on the right of you'r current kindle name there will be an edit button. click this and re enter the name you want. after you have submited this your kindle will change. hope this could help :)
There really aren't any good GPS devices for under 50 dollars, but http://dealspl.us/GPS_deals/p_gps-navigation-for-dummies-3-5-fd-220-portable-gps1 seems to be a good choice for about 40 dollars.
You can email it to yourself at your kindle email address (look on Amazon under "Manage My Kindle" for this info). There may be a (very small, less than a dollar) feel.
Any computer monitor under nineteen inches will be sufficiently portable, if you still have the packaging.