Inviting (old) Coworkers

I started working for a small business about 6 months ago, but after 3 months of working there, my boss no longer needed me. He found a place for me in his other small business. My old coworkers from my first job still made me a birthday cake and invited me out to celebrate others' birthdays from their office even though I didnt work there anymore. I went to their events and even a fundraiser. Now, they are throwing me a wedding shower,even though I dont work there anymore. They are inviting everyone from my new job and the old job to the shower (they share the same office building). I am on a very tight budget and am worried they expect to be invited to the wedding. My wedding is about 6 weeks away and I have already sent out the invites. If I did invite all of my coworkers from both my old and new jobs, I would be adding about 40 people to my guest list. Is it okay to just give them some nice thank you gifts like fancy chocolates as a thank you instead? Thank you in advance!