Alternative Bets when is exact bet is not offered

Sometimes I do not have access to for example Bet365’s U3 Goals for 2.1 because I am gubbed, but I see on the same game, the U2.5 for 2.7 on Smarkets.

So, correct me if im wrong, the alternative to U3= U3.5- Exact 3 Goals Bet. So I back U3.5 and lay exactly 3 goals, and if the odds are higher than the ones offered for U3 then I have a value bet?

Or another example is a bet where a team wins where the equivalent is on a bet builder for the team to score O0.5 and the match winner.

Interested to read how you guys deal with such :slight_smile: