Webcams are available from many online stores such as Amazon and eBay. Also, there are many "mom and pop" computer stores which will have the best prices because of their low overhead costs.
Yes stickam.com does support connections from Mac webcams.
download.cnet.com/mac/webcam.software
Webcams manufactured by Dell are easily seen as being the most compatible of all webcams. Whether you own a PC or a Mac, Dell will have a great webcam for you. Dell.com will have information which will find the perfect webcam for your computer or laptop.
Vaio computers have the Windows software and the parts for these computers are cheap to replace when something falls apart. Mac computers are more expensive to replace parts on. There are also some programs that are not offered on Mac but are offered on PC.
Try out http://www.vinixcomputer.com. They sell Macs as well as other computers for nice prices.
This all depends on the type of components and software you want. Some cheap computers can be bought for around $200. You can also find computers that are much more expensive and range from $900 - $1,200.
Parallels isn't a place that sells Apple Mac computers. It simply allows an Apple Mac user the opportunity to purchase Windows operating systems for their Mac.
Amazon has several mac computers for sale through their e-commerce store. There are also several mac computers up for bid on eBay if you don't mind participating in an auction to purchase it.
Everywhere ?
Are you asking about MAC address
Quality costs be it a computer or any other consumer product. Want the very best then you will have to pay for it. Even a quality Windows PC is not cheap. The difference is that Windows does not make computers they just make operating systems which are installed in cheap computers made for the masses. Only Apple makes computers running Mac OSX and they are all quality made. There are no cheaply made Mac's.
Apple Mac computers are always more expensive than other computers as they are considered a high quality product. If you want to spend less money search ads for used computers that are a year or two old.