A "mystery bag" filled with discounted items, sold on the New Year.

a new year / New Year / New Year's Day

to sell

to sell something (to agree to transfer goods) / to sell someone out, to betray / to agitate, to incite

selling / selling point / (stock market) sell order

a first, start, a beginning / (slang) first sexual relations, one's first time

to buy / to value, to appreciate, to have a high opinion of someone / to provoke someone, to stir

buying, shopping

the first..., initial..., new...

a first, start