There is an on-line 8-day Buddhist meditation retreat available here:
Detailed description (including links to source materials)
You can sign up for the retreat and work with an instructor, or you can use the source materials, videos etc, on your own at your own pace.
If you sign up, they ask for a donation, whatever you feel like paying, after the retreat.
This style of meditation is based on the teachings of the Buddha. Most "Buddhist" meditation taught today is based on later commentaries on what Buddha taught.
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