The samples can be sent, pls kindly inform me your express account and address, then we can send out the samples. Tks. 我一般都是这么说的，如果是真心想做生意的一般都会给你到付账号。希望这个能帮到你
客户想免费拿10几个样品又不想付运费，怎么英文回复我们可以提供运费但是我们坚决不服运费？
运费到付
[经] freight collect
freight
英 [fre?t] 美 [fret]
n.运费;货运，货物;船运货物;货运列车
vt.运输;装货于
collect
英 [k?lekt] 美 [k?l?kt]
vt.收集;收藏;接走;聚积
vi.募捐;募集
adj.由受话人付费的
例句：
1、提货单上应该是运费到付而不是运费预付。
The Bill of Lading should be marked "Freight Collect" instead of "Freight Prepaid".
2、我们已按运费到付安排装船。
We have arranged shipment with freight to be collected at destination.
3、运费到付-由收件人支付所有的运费和目的地国征收的关税和税金。
Freight Collect the consignee pays all shipping charges and the destination country′ s duty and tax, if applicable.
4、请告知收件人的快递帐号，因我方希望运费到付。
Also please advise receiver's express account number, as we prefer freight collect.
5、买方将有缺陷的货物交由第一艘便船运给卖方，运费到付。
The buyers ship the defective goods to the sellers by the first available steamer,carriage forward.
Kindly be informed that, I did my utmost to discuss with our president to provide you the free samples, but the freight charge cannot be omitted. Pls kindly accept.