Hi I saw you were giving 2x6oz bottles
I'm also in CA. I hired a pump, was about $50 a month, helped loads.
DD had 8-12oz while I was at work and she had unlimited access the rest of time. We/She fed every 2 hourly for months, but was/is a slow weight gainer so was reluctant to change it.
At 4 months I pumped twice a day at work (also have disapproving boss but felt this was important). At 7 months (only 3 months away) we had on one 3oz bottle at lunchtime, at 9-10months I stopped expressing all together. I think at 6 months she was on 8oz or less (we were 1oz an hour, I would feed just before leaving and ring DH when I was on my way back so he knew to hold off a feed if I was only 30mins away)
If yours is getting at least 8 oz, I would try and not worry. What helped for me when I saw supply dipping was to pump after every day feed at the weekend. Did this about once a month (I called it a turbo boosting weekend).
Can you have someone meet you with the baby just outside work for feeding.
I am sure a few of us could club together to get you a pump for a few months.
It's crap over here isn't it. I'm pg again and my boss has made it clear how unhappy he is with it. I can't do a few months mat leave again, so we're heading back to the UK in August.
Hope some of this helps
PA