I LOVE fonts, I have hundreds and am always on the hunt for more. Whether you're looking to purchase or looking for some freebies, these are the spots I go in order to grab some new ones.
If you're looking for freebies:
Da Font offers free fonts in a variety of styles that you can search through. They have a little bit of everything: scripts, decorative, handwritten, serifs, san serifs, distressed, etc. With free fonts you have to be careful that you are adhering to their license agreements. If you're using the fonts for personal use (ie. creating a baby shower invitation, designing a wall hanging or chart for your home) you are fine using any of the fonts. However, if your usage is 'commercial', only certain fonts are allowed. To the right of each font, it'll say 'Free for personal use, Free for personal and commercial use, 100% free, or donationware'. To stay on the right side of the law, make sure you adhere to the license agreements.
There are thousands of font foundries (meaning companies who create fonts). You can make a list of different foundries that you like by going to myfonts.com and browsing through different styles. Once you find a bunch of fonts you like, click on the overview and find the foundry who created the font. Go to their website. Many times they offer freebies on their site.
If you're looking to buy fonts:
My Fonts is great for one off purchases; for example, if you just need one weight of a font, you can purchase that inexpensively on myfonts.com. They also run specials frequently, so checking 'Special Offers' in the navigation is a good place to start. If you want to purchase the entire family of fonts (meaning all of the weights of that particular font: light, regular, medium, bold, black, etc.), checking the foundry’s site, which will be located in the ‘overview’ section, might get you a better bundle deal. This is where I buy 99% of my fonts, the site tracks your purchases and if you somehow lose your fonts due to a computer issue you can always re-download and install.
Cloud based fonts are a bit new but if you have an Adobe Creative Cloud membership you get a certain number of fonts included via Typekit. The way it works is you go to the website, log in with your Creative Cloud user name and password and you have access to a certain number of fonts based on your membership level. You 'sync' the fonts you want to use and you are automatically given access to them in your computer programs.
In addition to occasionally having free fonts, a Foundries main business is selling fonts. Some of my favorite Foundries are Frere-Jones Type, Sudtipos, URW++, Latinotype, Cultivated Mind and FontFabric. Their websites offer many styles and collections for purchase.