1 on 1s are downloads only. Some DVDs that Theory11 offers can be download and the actual DVD for an extra $5 or so. The 1 on 1s are for utility moves or smaller tricks that aren't long enough for a DVD. DVDs have multiple tricks and routines in them, hence why they are on the DVD. Hope this helps.
As others here have stated, our 1-on-1 training section is dedicated solely to downloadable material - offered a la carte. That said, many of our core effects are offered in a downloadable format, as well.