I really like NatalieS suggestion, Dendrobium peguanum. Too bad it can't be found at the Canadian vendors...

There were two Canadian vendors that don't have sites, but will send you a catalogue on request, so I might do that. Although, as Camille says, it's better to go with known growers so that you can get an idea of the quality of the plants.

Yeah, some of these are great ideas, but have limited availability across all three+ regions. That's why camille and Co needed some help, because you've gotta call the vendors, ask if they have them, ask how many... blah blah blah, lots of time. I would've offered to help, but I'm writing my doctoral thesis right now, and I've only got time to procrastinate on some orchid websites. Not to mention, I'd probably buy a bunch of stuff if I called them, just ask Peter...
Thanks again to those who are helping out!

Oncidium ornithorhynchum
 

Oncidium ornithorhynchum ?
IOSPE PHOTOS

And Schwerter has it for 9.95 EUR. I haven't found any of the other suggestions in the EU so far... This seems tricky. :shock:

It's okay, I live in Sweden so I won't have any problem getting it. :)

Oncidium ornithorhynchum - FS here: Orchideeen-shop.nl - Botanische orchideen
(Claessen Orchideeën, very good quality.)

Please add Tropical Gardens Orchids to Canadian vendors list. I had good experience with them and they have nice selection of Neofinetias and Paphs.
Tropical Gardens Orchids
Thank you.

I did some digging through the posts only linking to American vendors and came up with this:

Sophronitis cernua for 19 EUR at Elsner orchids .

Leptotes bicolor for 9.95 EUR at Schwerter Leptotes bicolor - Orchideen der Schwerter Orchideenzucht

And also at a Swedish vendor for 17 EUR Leptotes bicolor

Seidenfadenia (Aerides) mitrata at both Elsner and Scwherter for 14.90 EUR and 17.95 EUR, Elsner orchids Brassavola digbyana var. fimbripetala - Orchideen der Schwerter Orchideenzucht

I know Paramount has this for $28.00 as I just recently bought one! So I vote for that :)