Before you say you want brighter headlights, do some research on what you want. I can sell you a set of "brighter" bulbs and charge you $100. You need to know what you want rather than walk into a store, plop your money and say you want this. This will have ripped off.
Ultimate Retrofit thread/hid thread.
If you get plug and play HIDs, there are vendors on this forum (in the main forum all the way at the bottom) or in the FOR SALE section that sells kits. You can easily purchase them for under $150 and install it yourself or have a friend install it for you.
Just walking into a store can cost more for parts and labor. The PNP kits are a cheap alternative.
If you want a true and safer HID option, get a retrofit. Everything you need to know between the two is in the link I posted above.
Another option is maybe meet up with someone from the forum who has HID kit put in and have them help you since they have done it already. They may do it free because they're generous like that or you can offer to pay them a little something or even pay for lunch for their troubles. All you need to do is purchase HID kit. There are also other threads on what type of HID kits are available on the web and what brands.