B2 可以买的;可以用的
available to be bought or used
We were amazed at the range of products on offer. 有这么多产品可选，我们很惊讶。
I'll take a look at their website and see what's on offer.
There are so many vegan meat substitutes now on offer.
They have a leaflet telling you about the range of services on offer.
Do shop around to see what's on offer before you make any decisions?
See also: offer noun