"David Manzur" is certainly an attractive cultivar. One of the darkest flowers I've seen on a Bollea.
I recently got a B. coelestis from Andy's (you have to call in if you want one - they are not on his website). I have also seen them up for sale on Ecuagenera, Orquideas del Valle, and Petite Plaisance (the first three vendors I mentioned have mature plants available, and the last one sells seedlings). Good luck finding named varieties and hybrids of this plant, though - they're rare. Usually, all you'll be able to find is the regular species. Most of the plants available are seed-raised, so there is variation in flower color, size, and shape.
While I am still gaining experience with this species, I am growing other Bolleas, so I can help you with their culture.
All in all, they aren't too difficult as long as you can avoid letting them dry out completely. These plants lack pseudobulbs and as such need to be kept moist throughout the year. They like their potting medium moist, but not soggy, and with good drainage. I water mine as they are
approaching dryness. In other words, I don't let the medium get bone-dry. I've found that they're reasonably tolerant of hard water as long as you leach the pot every time you water. Otherwise, their leaf tips will turn brown and die back. They grow throughout the year, so they don't need a rest period as do other sympodials.
Bolleas are low-light plants. They can take some morning sun, but in general, they like phal/paph light. They like good air circulation and high humidity, too (in the 60-100% range, give or take).
They grow well in plastic pots or baskets (I wouldn't recommend wood baskets because the roots cling and it's tough to get them out should the plant need a new container). I have mine growing in a mix of perlite, sphag, bark, and lava rock.
One last thing - don't expect these to look pristine (I.E. clean, shiny leaves). In general, they are tall, sprawling plants that have long, floppy leaves arranged in fans. That said, the plants usually look messy and untidy, and the leaves are prone to bending or twisting (especially after windy days). And don't be surprised to see some spotting on the leaves; they tend to develop "freckles" here and there as they age.
Unlike most other Bolleas, the coelestis are BIG plants (I just put mine into an 8" pot)! If you're looking for a more compact plant, try B. violacea, B. ecuadorana or, if you know where to look, B. pulvinaris.
Hope that helps.
Have you seen Bollea coelestis 'David Manzur'
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