Here are some of the cheapest platforms for creating and selling online courses:

• Podia: Podia is a great option for creators who want to sell courses, digital downloads, and memberships. It offers a free plan with unlimited students and courses, and paid plans start at $33 per month.
• Thinkific: Thinkific is another popular platform that offers a free plan with limited features, and paid plans start at $29 per month.
• Teachable: Teachable is a good option for creators who want to sell courses and build a community around their content. It offers a free plan with limited features, and paid plans start at $29 per month.
• Skillshare: Skillshare is a marketplace where creators can offer their courses for free to Skillshare members. However, creators do not earn any money from their courses unless they have a paid Skillshare membership.

When choosing an online course platform, it is important to consider your needs and budget. If you are just starting out, you may want to choose a platform that offers a free plan or a low-cost plan. As your business grows, you can upgrade to a more expensive plan that offers additional features and support.

Here are some factors to consider when choosing an online course platform:

• Features: The platform should offer the features you need to create and sell your courses, such as a course builder, a payment processor, and a student management system.
• Pricing: The platform should be affordable for you and your budget.
• Support: The platform should offer support in case you have any questions or problems.

I hope this helps!