Hi! It is possible to make your figurine in polymer clay, or any clay for that matter, then cast your "original/master" in a silicone. From the silicone mold you can cast in a two part resin. Not very expensive. Once you have a master mold casting in the resin will become cheaper the more figirines you cast. Have a look on You Tube there are many videos for you to learn from. Hope this helps.
One more thing... If using platinum (addition cure) silicone you have to make sure the model, and whatever will touch the platinum, will not inhibit your cure. You may want to use tin (condensation cure) silicone. It is less fussy about what it is cured against. Tin molds will not last as long as platinum molds will but will cost less. Keep your first casting as your master model. Then as your mold wears out you can make another from yout master. a mould release will help your mold last longer, as well. You will need to contact a supplier to get all the facts and products that work well together.