All pcs can run Linux. Specifically, you can download and run Ubuntu, which is Linux based. Any PC can run Ubuntu and/or dual-boot Windows and Ubuntu.
Some private small stores do sell computers with Linux installed. Linux is in its original idea free for all and easy to download from official pages. An easy to use Linux version that is user friendly, to new users, is Ubuntu
One can find a laptop with Linux at any available online seller. In fact almost all laptops have Linux and in some cases buyers choose to pay a license for Windows. Best places to find laptops with Linux are Amazon, Best Buy and Overstock.
It is possible to buy a gaming desktop for under 500. Amazon and Ebay have the widest range of desktops available under 500, however there are a few websites such as Curry's that also offer gaming desktops for under 500.
Most Logitech webcams are supported by Linux.
Should I buy a Linux, I basically asking, should I kill myself, and all my friends :/, unless your name is Max then no
Desktop is way cheaper.
Any mid-range desktop or laptop would be suitable for use with Linux and have enough power for web design. Dells, Acers, and ASUS laptops tend to have high compatibility with Linux (I would not get an ASUS Eee PC for web design, as it is slow and has a low resolution).
If you want to buy a wireless VOIP router for your Toshiba desktop then you should look into Linksys. You can buy the router for your desktop at Linksys.
I think you can do it with just a wireless router, but make sure you lock it down. http://www.komando.com/tips_show.asp?showID=8796
PHP with Linux is completely different, since everything is free (Linux, Apache, Mysql, FileZila, PHP, etc.). Linux is also way more stable for production use, since it's regularly updated (at least once a months, for certain distribution). Remember, the Internet runs on Linux, mostly CentOS and RedHat.However, windows is way more compatible with everyday applications. The best would be to have a development computer running Linux (buy an old, use computer, install Linux on it), and have an everyday Windows computer.
microcenter.com
You can buy a cheap desktop organizer at your local Target or Wal Mart. But you also have to buy the cleaning supplies separately since desktop organizers do not come with cleaning supplies.