I have been a cub scout leader for 4 years. I know it can be overwhelming in the beginning. I always tell parents not to worry about cost. We NEVER turn someone away because they can't afford it. Go to the committee meeting. Ask them what help is available. Chances are your Tiger leader is new to all this also. He/She may not have all the answers.
In our pack the dues are $55.00 per year. If we sell at least $250.00 of popcorn, the dues are waved. So you would only need the uniform. If you can't afford the uniform (we only require shirts and scarves.) then find out where you can get help. I would ask the webelo den. They may be willing to give up there old uniforms. I always donate all the uniform pieces that my boys have outgrown back to someone who needs it. You can go to your local Lions club or Masons and ask them for help in uniform/dues costs. These groups have been known to help out boys in scouting. I collect $2.00 per den meeting for supplies. I am very frugal about spending den money. Most of our projects and field trips are free or very minimal cost.
Tiger cubs need a adult partner at each meeting. The partner can be Mom, Dad, Grandma, Grandpa, Aunt, Uncle, Friend.... Any adult you want to send with them. After the Tiger (1st grade) year parents are not required to stay at meetings. I find most parents want to stay anyways in our dens.
It is up to the leader how many times you meet per month. I always have done 2 den meetings per month, and 1 pack meeting. When we go to a field trip we do it in place of a den meeting. We have never had a problem completing requirements for the badge. There is no reason scouts can't make up things from a missed meeting. It isn't always possible to make every meeting. The leader should be understanding. However, the leader should only have to tell you once, and it is your resposibility to get it done and report back. There are many times I would have to remind parents over and over and they wouldn't get it done.

A den leader feels a responsibility to get all the boys there awards. It feel really bad when one boy doesn't get the award and the rest do. Even if it isn't the leaders fault.
One last thing I like to point out is if you don't like the way things are done then go to the committee meetings. Volunteer! It isn't easy running a den or a Pack. Usually we have minimum help to do so. We do what we can. I became a leader 4 years ago because no one else would do it. I get really bothered by parents who complain about the way the pack is run, but won't help out. (Not the new tiger parents who are just learning the ropes, but the ones who have been in the program over a year.) Our pack isn't as organized as the parents would like. Thats because our committee consists of 5 leaders and 1 committee chair/Cubmaster. So 6 people total. That is it. We are doing everything, and every one of us has a full time job and other commitments too.