A LOT of people snore (myself included) and I have had cabin mates that snore.
When it comes to looking for a cabin share all you can do is be honest. Most people will only find it to be a problem if they did not know about it in advance.
Personally, I wear ear plugs to bed anyway because I don't like to be awakened by unexpected noises in the middle of the night.
I have tried them all, and I have found these to be the best (and also the cheapest). The reason they are the best is because they are very soft, so they not only feel more comfortable, but they fit in and stay in the ear. here is the link:
Mack's Safesound Earplugs 100ct | Walgreens
I suggest you buy some of these and take them with you - because a lot of people will say "I don't like ear plugs," or "they don't work." Well, these work and they are comfortable. (I noticed they are top rated at Walgreens).