4 files changed, 8 insertions, 6 deletions
diff --git a/packages/instant/src/components/buy_button.tsx b/packages/instant/src/components/buy_button.tsx
index 3ef7c1f5c..adc32f071 100644
--- a/packages/instant/src/components/buy_button.tsx
+++ b/packages/instant/src/components/buy_button.tsx
@@ -24,7 +24,7 @@ export class BuyButton extends React.Component<BuyButtonProps> {
         onBuyFailure: util.boundNoop,
     };
     public render(): React.ReactNode {
-        const shouldDisableButton = _.isUndefined(this.props.buyQuote);
+        const shouldDisableButton = _.isUndefined(this.props.buyQuote) || _.isUndefined(this.props.assetBuyer);
         return (
             <Container padding="20px" width="100%">
                 <Button width="100%" onClick={this._handleClick} isDisabled={shouldDisableButton}>
diff --git a/packages/instant/src/components/zero_ex_instant.tsx b/packages/instant/src/components/zero_ex_instant.tsx
index 142e74dae..ffa5a8250 100644
--- a/packages/instant/src/components/zero_ex_instant.tsx
+++ b/packages/instant/src/components/zero_ex_instant.tsx
@@ -31,7 +31,7 @@ export interface ZeroExInstantOptionalProps {
 }
 
 export class ZeroExInstant extends React.Component<ZeroExInstantProps> {
-    public store: Store;
+    private readonly _store: Store;
     private static _mergeInitialStateWithProps(props: ZeroExInstantProps, state: State = INITIAL_STATE): State {
         // Create merged object such that properties in props override default settings
         const optionalPropsWithDefaults: ZeroExInstantOptionalProps = {
@@ -58,14 +58,14 @@ export class ZeroExInstant extends React.Component<ZeroExInstantProps> {
     }
     constructor(props: ZeroExInstantProps) {
         super(props);
-        this.store = store.create(ZeroExInstant._mergeInitialStateWithProps(this.props, INITIAL_STATE));
+        this._store = store.create(ZeroExInstant._mergeInitialStateWithProps(this.props, INITIAL_STATE));
         // tslint:disable-next-line:no-floating-promises
-        asyncData.fetchAndDispatchToStore(this.store);
+        asyncData.fetchAndDispatchToStore(this._store);
     }
 
     public render(): React.ReactNode {
         return (
-            <Provider store={this.store}>
+            <Provider store={this._store}>
                 <SelectedAssetThemeProvider>
                     <ZeroExInstantContainer />
                 </SelectedAssetThemeProvider>
diff --git a/packages/instant/src/constants.ts b/packages/instant/src/constants.ts
index 7f4c5a058..31491c80a 100644
--- a/packages/instant/src/constants.ts
+++ b/packages/instant/src/constants.ts
@@ -1,3 +1,4 @@
 import { BigNumber } from '@0x/utils';
 export const BIG_NUMBER_ZERO = new BigNumber(0);
 export const ethDecimals = 18;
+export const DEFAULT_ZERO_EX_CONTAINER_SELECTOR = '#zeroExInstantContainer';
diff --git a/packages/instant/src/index.umd.ts b/packages/instant/src/index.umd.ts
index fe78ce401..f648b37f2 100644
--- a/packages/instant/src/index.umd.ts
+++ b/packages/instant/src/index.umd.ts
@@ -1,8 +1,9 @@
 import * as React from 'react';
 import * as ReactDOM from 'react-dom';
 
+import { DEFAULT_ZERO_EX_CONTAINER_SELECTOR } from './constants';
 import { ZeroExInstant, ZeroExInstantProps } from './index';
 
-export const render = (props: ZeroExInstantProps, selector: string = '#zeroExInstantContainer') => {
+export const render = (props: ZeroExInstantProps, selector: string = DEFAULT_ZERO_EX_CONTAINER_SELECTOR) => {
     ReactDOM.render(React.createElement(ZeroExInstant, props), document.querySelector(selector));
 };