Used Sail Spinnaker 3055 Butler Verner sail for sale. Masthead Sailing Gear has 1000s of new and used sails in stock.
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Here's a link to Masthead Sailing Gear's sail search tool. https://mastheadsailinggear.com/used-sails/
You can fly a symmetrical spinnaker without using a spinnaker pole.
ATN makes a product called the tacker. here's a link. https://atninc.com/atn-tacker-sailing-equipment.shtml
The patented Tacker was developed to control the tack of a spinnaker. By fastening the Tacker over the furled headsail and it allows you to use your conventional symmetrical spinnaker like an asymmetrical spinnaker from beam reaching to broad reaching without the need of the spinnaker pole.
Used Sail Spinnaker 3055