I have a much different take than the previous two posters.
The first mandolin I played was a horrible little 45 dollar ebay deal that my friend bought…
Since then I’ve caught the bug and I can’t pass a mando/OM/zouk without picking it up and fiddling around on it.
I personally think that if you’re going to “start” you can do very well with some cheaper mandos, get one that’s playable but not perfect, your tone wont be that great but if the action is right you’ll be able to learn on it without investing a heavy chunk of change. I saw a used epiphone I believe it was up at guitar center for 100 bucks and when I played it, it was actualy a quite nice instrument. It didn’t have very good projection but it played fairly smooth and was in tune with itself (which is really easy to accomplish with a non fixed bridge instrument)
My suggestion would be to pick up a cheapy but not a “crappy” instrument. If you go with a respected maker and pick up a low end mando from their line you’ll have a quite serviceable instrument, then you blow another 30-40 bucks taking it to a mandolin pro to have it set up properly.
imo, the epiphone mm-20, 30, and 30E are all decent newby instruments. They play decent but the quality of tone is lacking a bit and their projection is lacking… but if you’re just learning you might like the fact that they’re a little quiet
Of those three, the 30E is the most expensive at like 170$ average price.
I do agree that if you intend on taking it serious you should get at least a midrange mando which will cost you in the range of 500-800 dollars and be perfectly serviceable and just shy of stage worthy.
Honestly, the comparison of a 250 guitar as serviceable is subjective, to some one like my friend who’s classically trained picking up a 250 dollar guitar makes him shudder and he says it makes him a bad player… but the stuff he has trouble with on a cheapy guitar (that is actualy perfectly serviceable) I can play fine and we can both play great on his 5000 dollar classical from madrid 
learning on a lower end but still fully functional instrument can teach you things you’ll never learn playing on a high quality instrument.
So, cliff’s notes: Buy a low end model of a respected company and you can bet you’ll get a good enough instrument to learn on, take that instrument to a pro and have it set up. you’ll want to do that with any instrument, and if you can.. sit with the guy doing the set up and talk to him/her, find out what they’re doing and why and have an open conversation with them about what you’re trying to do and work with them so they set it up for YOU not just what they think is right.