What is the cheapest way to buy 100,000 USD worth of bitcoin?

Is it Coinbase? (1% purchase fee)
Cost to buy $100,000 BTC = 100,000 * 0.01 = $1,000 (1%)

Is it Bitstamp? (~$30 bank wire transfer fee + 0.1% deposit fee + 0.2% trade fee)
Cost to buy $100,000 BTC = 30 + 100,000 * 0.001 + 100,000 * 0.999 * 0.002 = $329.8 (0.33%)

Is it Localbitcoins? (~5%+ premium over market price)
Cost to buy $100,000 BTC = 100,000 * 0.05 = $5,000 (5%)

Is it BitYes via EgoPay? (~$30 bank wire transfer fee + $12 EgoPay deposit fee + zero BitYes deposit or trading fees)
Cost to buy $100,000 BTC = 30 + 12 = $42 (0.042%)

https://www.bityes.com/topic/egopay_deposit

http://www.coindesk.com/huobis-bityes-teams-egopay-fee-free-usd-deposits/