Before you buy a theme it’s always worth trying a free version first but if you are on a really tight budget free themes are getting good now and can easily be used to run a website or blog. I use a mixture of free and premium themes on my websites and here I list those folk I have downloaded from and recommend because I like the themes.
I like free themes from mythemeshop and can recommend them to you (to be honest I also get a small payment if you link through me and buy a not so free theme) but you don’t have to buy simply enjoy the free themes.
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SKT Themes I use a lot and indeed this very site uses a free version of their Full Width theme (with a child theme of course). It could be time for me to change so watch out!
Link to their free bits through this link SKT Free Themes
Other folk I have used for free themes are WooThemes. Jump to their free section here.
I really like WooCommerce and use it on the certain websites with and without a WooTheme and I like many of their plugins. Take a look.