What are my options for a bike trailer?
There are several options, you could make your own if you are the handy type. Or there are many ready to purchase from a local shop or online. Most of the ones that I see have a 120lb limit. So you would be close but probably fine as the max weight is generally higher than that listed for liabilities sake. 

As for store bought option there are a lot of different companies that make trailers for bicycles both for hauling cargo, and touring applications as well as child carriers of course.

Here is one design just to give you an idea. The last time I saw a similar one in a shop I think it was about 200 bucks.

http://www.jbi.bike/web/checking_product_description.php?part_number=98014

The type shown above attaches to the rear axle by way of that long arm at the front. Building one could be tricky if you don't have the proper tools and I imagine you would need to buy an axle intended for it. 

If you want to go the DIY route, I found this write up that looked interesting and could be helpful. 

http://www.instructables.com/id/Bicycle-cargo-trailer--200-lb-capacity,-$30-for-pa/