I like to visit thrift shops.
I do too! I enjoy the low costs but also how some items can be sold at competitive prices.
I like how there is always something new and different every time you go.
They mainly sell used goods but most of the time you can find them in good condition.
Yes and there is so much to look at there.
A thrift shop is also know as a charity shop run by a charitable organization to raise money for a good cause. 
I prefer to shop at the ones that actually do go to a good cause.
All remaining income from sales are used for the stated charitable purpose after all costs are paid.
Goodwill does not work that way though.
Goodwill Industries
Goodwill Industries International Inc., or shortened to Goodwill, (stylized as goodwill) is an American nonprofit 501(c)(3) organization that provides job training, employment placement services, and other community-based programs for people who have barriers preventing them from otherwise obtaining a job. In addition, Goodwill Industries may hire veterans and individuals who lack education or job experience or face employment challenges. Goodwill is funded by a massive network of retail thrift stores which operate as nonprofits as well. Goodwill's answer to its profit status is
Charity shop
A charity shop, thrift shop or opportunity shop (colloquially referred to as an op shop) is a retail establishment run by a charitable organization to raise money. Charity shops are a type of social enterprise. They sell mainly used goods such as clothing, books, music albums, DVDs, and furniture donated by members of the public, and are often staffed by volunteers. Because the items for sale were obtained for free, and business costs are low, the items can be sold at competitive prices.