What are the options and prices to get from Gibraltar and southern Spain to Morocco with a bicycle?
I've found some ferries that operates there, however all of them cost over 35 euros round trip. Is there any cheaper option?
Yeah, Ivan is right. Your options are to pay for the ferry and take the bike or fly and buy a bike when you get there. I guess it's really up to you and how attached to/expensive your bike is.
The other option is to maybe hang out around the docks for a few days and ask ships if they're heading across and will give you a lift, however I would recommend entering Morocco legally, so you'll need to get dropped off where there is an immigration office (so essentially where the Ferry drops you). To be honest if you want to travel you have to spend some money and 35 euro is not really that much to get from one country to another with a bicycle.