I saw Hellebores the other week, really pretty but OMG the price.
I think they're expensive because they take a years or two to get to flowering stage, so require a lot of care from the nursery that produces them. Also there is plant breeding to take into account that produces those showy cultivars.
OTOH If you know someone who has ordinary bog standard Lenten Roses in their garden they'd probably be happy to give you some seedlings as the common or garden ones seed themselves prolifically. That's how I got mine.
Self seeded ones can be any colour ranging from white to plum. Gardening writers tend to be very snooty about them but, as one of the first flowers of the year I find even the derided 'muddy' pink ones to be a welcome sight.
The common ones also bulk up nicely. I bought a beautiful deep red named variety from Harlow Carr about 4 or 5 years ago and it hasn't got any bigger than it was when I bought it.☹