A lot depends on whether they have to go up the tree and take it down in bits, and if so, how many bits. It’s just time = money. If you can lop off branches safely by yourself, start with that. I had to get a big sycamore taken down which took 3 days, 8 person-days of work and £1500 all in (including disposing of the brash and leaving the wood) which stung a bit but I thought was fair (lowest of 2 quotes). Last year my parents had a fallen apple tree removed for about £150 which also seemed good value – I’d have done that myself but wasn’t around.